Pb(II) coordination and synergistic ion-exchange extraction by combinations of sulfonamide chelates and 2,2'-bipyridine

Inorg Chem. 2005 Apr 18;44(8):2573-5. doi: 10.1021/ic050047r.


The disulfonamide ligands 1,2-C(6)H(4)(NH(2)SO(2)C(6)H(5))(2) (1) and 1,2-C(6)H(4)(NH(2)SO(2)C(6)H(4)-p-Bu(t))(2) (2), which are readily available in good yields from o-phenylenediamine and the corresponding sulfonyl chlorides, efficiently extract Pb(II) from water into 1,2-dichloroethane when used in synergistic combinations with 2,2'-bipyridine via an ion-exchange mechanism. The extraction was shown to proceed via the formation of a ternary Pb-sulfamido-2,2'-bipyridine complex. The X-ray crystal structure of the binary Pb-sulfamido complex 3 shows a coordination polymer with a stereochemically active lone pair on Pb formed by S=O-Pb axial coordination.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • 2,2'-Dipyridyl / chemistry*
  • Cations, Divalent
  • Chelating Agents / chemistry
  • Ethylene Dichlorides / chemistry
  • Ion Exchange
  • Lead / chemistry*
  • Ligands
  • Molecular Structure
  • Sulfonamides / chemistry*
  • Water / chemistry


  • Cations, Divalent
  • Chelating Agents
  • Ethylene Dichlorides
  • Ligands
  • Sulfonamides
  • Water
  • Lead
  • ethylene dichloride
  • 2,2'-Dipyridyl